package main
import "fmt"
import "unsafe"

const (
    aa = "abc"
    bb = len(aa)
    cc = unsafe.Sizeof(aa)
)

func main() {
    const LENGTH int = 10
    const WIDTH = 5
    var area int
    const a, b, c = 1, false, "str"

    area = LENGTH * WIDTH
    fmt.Printf("面积为：%d", area)
    fmt.Println()
    fmt.Println(a, b, c)

    println(aa, bb, cc)
}
